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为了验证西南印度洋中脊50°E区域的残留熔融体与8~11 Ma前的岩浆供给活动的相关性,用有限元方法对洋壳模型进行热力学数值计算,以期解答超慢速洋中脊热液活动是由于古岩浆房长期持续供热,还是依赖周边热点提供持续的岩浆和热融熔问题.实验模拟了水平层状洋壳模型和地震试验得到的实际洋壳模型两种情况,对水平层状洋壳模型研究了上地幔有、无持续岩浆供给两种情况,对实际洋壳模型研究了一次岩浆供给的情况.结论如下:如果洋壳层底部没有持续热供应,岩浆房持续时间约为数千年或数万年;西南印度洋中脊中东段隆起区的热液活动和岩浆房最多持续存在0.8 Ma,现今热液活动的热源并不是8~11 Ma前的岩浆供给提供的.
In order to verify the correlation between the residual melt in the 50 ° E region of the mid-Southwest Indian Ridge and the magma supply activity before 8 ~ 11 Ma, finite element method was used to calculate the thermodynamic data of the oceanic shell model in order to answer the super slow mid-ocean ridge heat Fluid activity is due to the long-term heating of the ancient magma chamber, or rely on the surrounding hot spots to provide continuous magmatic and hot melt problems.Experimental simulation of the horizontal layered oceanic shell model and the actual oceanic shell model obtained from the earthquake test two cases, the level The stratiform oceanic crust model studied two situations of the upper mantle with and without continuous magma supply, and studied the magma supply to the actual oceanic crust model.The conclusions are as follows: If there is no continuous heat supply at the bottom of the oceanic crust, the duration of the magma chamber is about For thousands of years or tens of thousands of years; the hydrothermal activity and magma chamber in the uplift of the central-eastern Mid-Eastern Indian Ocean ridge last for a maximum of 0.8 Ma. The current heat source for hydrothermal activity is not provided by the magma supply from 8 to 11 Ma ago.